diff --git a/requirements.txt b/requirements.txt
index dd379d4..774d11b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
 pycurl>=7.43.0
+certifi>=2019.9.11
\ No newline at end of file
diff --git a/sentinel5dl/__init__.py b/sentinel5dl/__init__.py
index 0be61eb..172b95f 100644
--- a/sentinel5dl/__init__.py
+++ b/sentinel5dl/__init__.py
@@ -22,6 +22,12 @@
 
 logger = logging.getLogger(__name__)
 
+ca_info = None
+'''In order to use https, pycurl needs to utilize a certificate bundle.
+One may be supplied by your operating system,
+but if not, consider using certifi.where()
+'''
+
 
 def __md5(filename):
     '''Generate the md5 sum of a file
@@ -79,6 +85,10 @@ def __http_request(path, filename=None):
         curl.setopt(curl.USERPWD, f'{USER}:{PASS}')
         curl.setopt(curl.WRITEDATA, f)
         curl.setopt(curl.FAILONERROR, True)
+
+        if ca_info:
+            curl.setopt(pycurl.CAINFO, ca_info)
+
         curl.perform()
         curl.close()
         if not filename:
diff --git a/sentinel5dl/__main__.py b/sentinel5dl/__main__.py
index 736b458..6d0f766 100644
--- a/sentinel5dl/__main__.py
+++ b/sentinel5dl/__main__.py
@@ -8,6 +8,7 @@
 :license: MIT
 '''
 
+import certifi
 import logging
 
 import sentinel5dl
@@ -20,6 +21,8 @@ def main():
     logger = logging.getLogger(sentinel5dl.__name__)
     logger.setLevel(logging.INFO)
 
+    sentinel5dl.ca_info = certifi.where()
+
     # Search for Sentinel-5 products
     result = search(
             polygon='POLYGON((7.88574278354645 49.347193400927495,'